JP6654035B2 - Greening method of embankment slope - Google Patents

Description

  The present invention relates to a method for greening an embankment slope.

  For example, earth and sand (remaining soil) generated at a construction site or a factory site may be temporarily placed near the site or on the site in an embankment state.

  However, it is not preferable from the viewpoint of the landscape, the environment, and the safety that the remaining soil is temporarily placed in the state of the embankment. In some areas, the promotion and obligation of greening are described in so-called greening regulations, and even in private establishments, specific greening rates are specified.

  In this regard, although it is not a method of greening the remaining soil in the embankment state, as a method of greening a hard slope, a large number of through holes are provided in a hard slope such as a hard rock slope, and a predetermined hole of the through hole is provided. An anchor with a wing plate is cast in, and a vegetation cylinder composed of an organic vegetation layer, a fiber bundle body portion, and a void portion is inserted into a through hole other than the predetermined hole, and several holes other than the predetermined hole are inserted. A vegetation pocket is formed with the through hole as one block, and a vegetation base such as soil is inserted into the pocket for vegetation, and a portion of the hard slope other than the pocket where an anchor with a slat is installed is placed. On the other hand, it has been proposed that a base sand is sprayed to form a sand base layer, an organic vegetation layer and a deep vegetation layer are formed above the sand base layer, and vegetation is planted on the entire hard slope to green. (Patent Document 1).

Japanese Patent No. 2939850

However, such prior art does not first directly green the embankment, but the target slope is a hard slope such as a concrete sprayed face, a mortar sprayed face, a retaining wall face, or a hard rock slope. Therefore, no matter how compacted it is, there is a great difference in hardness between the hard slope and the embankment, and it cannot be applied as it is. Moreover, in the prior art, a large number of through holes are first provided, then anchors with blades are cast in the through holes, and a dedicated vegetation cylinder is prepared and inserted to form a vegetation pocket. After inserting a vegetation base material such as soil, vegetation is applied, and then the base sand is sprayed on the part other than the pocket where the anchor is placed to form a sand base layer, and further, organic vegetation is provided above the sand base layer It requires a great deal of labor and labor, such as forming layers, and requires a lot of necessary equipment.
Such a construction method is an excessively excessive construction method for greening the embankment, and is not practical.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a simple and appropriate construction method suitable for greening an embankment and to solve the above problem.

In order to achieve the above object, the present invention provides a method for greening an embankment slope, in which at least the surface of the embankment is laid with a guest soil, and a reinforcing material having an anchoring function is larger than 0 degree and 10 degrees. At the following elevation angle, it is made to enter while being rotated from the slope side of the soil by a rotary driving device, is connected to the reinforcing material following the reinforcing material, and a water-permeable hole is formed in a peripheral surface, and the rotary driving device is further provided. A pipe having a convex portion for obtaining a rotational force by locking with a driving portion is provided on the inner periphery near the rear end while rotating by the rotary driving device, and the pipe is inserted until at least the reinforcing material reaches the embankment. An approach operation is performed, and after the approach operation is performed at a plurality of locations on the slope of the soil, at least one of tree planting and seedling planting is performed on the soil.

According to the present invention, the soil is laminated on at least the surface of the slope of the embankment, and then the reinforcing material having an anchoring function is rotated from the slope side of the soil by a rotation drive device at an elevation angle of more than 0 degree and 10 degrees or less . is advanced while being rotated, subsequent to the reinforcement, is connected with the reinforcing material, and water-permeable pores are formed on the peripheral surface, a convex for obtaining a rotational force further engaged with the driving portion of the rotary drive device A pipe having a portion on the inner periphery near the rear end portion is made to enter while rotating by the rotation drive device , and at least the reinforcing material is penetrated until the reinforcement reaches the embankment, and the penetrating work is performed on the slope of the guest soil. At least one of tree planting and seedling planting is performed on the soil after performing at a plurality of locations. Therefore, the soil suitable for growing plants is provided with a reinforcing material having an anchoring function and a pad. The flop is prevented from slipping off from the embankment. Also, even if rainwater enters the soil, the pipe with the water-permeable holes is driven at an elevation angle greater than 0 degree and less than 10 degrees, that is, inclined downward at an angle of 10 degrees or less when viewed from the soil side. Because of the arrangement, the rainwater that has infiltrated the soil can be quickly drained to the outside through the pipe, so that even from this point, the soil can be prevented from slipping off the embankment.
In the present invention, it is necessary that the reinforcing material entering the embankment has pull-out resistance. For example, it is preferable that all the reinforcing materials enter the embankment after construction.

  And the construction itself, the soil was laminated on at least the surface of the slope of the embankment, and then a reinforcing material having an anchoring function was entered from the slope side of the soil, and a water permeable hole was formed on the peripheral surface following the reinforcing material. Since only pipes are inserted, the labor and labor required for construction are reduced as compared with the conventional case, the required equipment and equipment are smaller than before, and the equipment itself can be small if small-diameter piles are used.

  It is preferable that the mound inclination of the slope of the embankment and the slope of the guest soil is 1: 0.6 to 1: 2.0. Here, the mound inclination refers to the height (a) of the inclined surface: the horizontal length (b), as described in an embodiment described later.

  It is preferable that the penetration length of the pipe is longer than the thickness of the soil.

  It is preferable that the thickness for stacking the guest soil on the embankment is 0.2 to 1.4 m.

It is preferable that the length of the reinforcement entering the embankment is a length capable of sufficiently exerting an anchor function required for reinforcement.
Here, the length that can sufficiently exert the anchor function necessary for reinforcement is, for example, the length where the adhesion between the reinforcing material and the ground is larger than the tensile force, or when the reinforcing material is regarded as a pile, The length at which the pull-out resistance of the pile is greater.

  According to the present invention, the construction labor and labor are reduced as compared with the related art, and the required equipment and equipment can be smaller than before.

It is a side sectional view of the surplus soil in an embankment state. FIG. 4 is a side cross-sectional view showing a state in which guest soil is stacked on the surface of the remaining soil in the embankment state. It is a side view of a pile used in an embodiment. It is a side view of the pipe used in the embodiment. It is a side sectional view showing the state where driving of a pile was started. It is explanatory drawing of the front side of the slope side of the guest soil which shows the pitch of a driving part. It is a side sectional view showing the state where a pipe was connected to the back end of a pile and started to drive. It is a side sectional view showing the state where a pile and a pipe were driven in for a predetermined length and left. It is a side sectional view showing signs that a tree was planted in the guest soil.

Hereinafter, an embodiment of the present invention will be described. FIG. 1 shows a remaining soil 1 in an embankment state, and the remaining soil 1 is previously compacted by a known compacting device such as a roller type or a plate type. And compacted so as to have a cone index of, for example, 1200 kN / m ² or more. The mound slope (gradient) of the slope 1a is filled so as to be 1.2 to 1.4. Here, the mound inclination (gradient) means a value represented by the horizontal length (b) / height (a) of the slope 1a shown in FIG.

The soil 2 is laminated on the surface of the remaining soil 1. The soil 2 is piled up in parallel with the surface of the soil 1, and the slope 2 a of the soil is also formed on the slope 1 a of the soil. After the soil 2 is piled up on the remaining soil 1, compaction work is also performed on the soil 2 by a compaction device. In this case, the cone index soil dressing ^{2, 267kN / m 2 ~1510kN / m} 2, preferably from about 300 kN / ^{m 2.} In addition, as the kind of soil used for the guest soil 2, soil suitable for growing plants is used.

  The thickness of the soil 2 stacked on the remaining soil 1 is such that the thickness d after compaction is 0.2 m to 1.4 m on the slope 2 a of the soil 2 so as to have the above-mentioned cone index. The soil 2 is stacked on the remaining soil 1 such that The thickness d is appropriately selected depending on, for example, the type of tree, grass, or the like to be planted. The thickness d of the soil 2 is a thickness in a direction perpendicular to the surface of the soil 2 as shown in FIG.

  Next, a reinforcing material and a pipe enter and drive into the slope, and the reinforcing material and the pipe used in the present embodiment are as follows.

  First, as a reinforcing material having an anchor function, as shown in FIG. 3, a pile 12 in which a blade 11 is formed in a spiral shape on the outer periphery of a main body 10 is used. The pile 12 has a so-called auger screw structure in which a blade 11 is formed on the outer periphery of a cylindrical main body 10. The size of the pile 12 used in the embodiment is, for example, a diameter of 140 to 200 mm, a diameter of the main body 10 of 40 to 90 mm, and a length of 2000 to 3000 mm when viewed from the axial direction of the blade. Of course, the size is not limited, and can be appropriately selected depending on conditions and the like.

  As shown in FIG. 4, the pipe continuously entering the pile 12 is a pipe 21 having a cylindrical shape as a whole, and a plurality of water-permeable holes 22 penetrating in the thickness direction of the pipe 21 are formed on a peripheral surface thereof. . In the present embodiment, the water permeable hole 22 has a long hole shape that is long along the axial direction. Of course, the shape of the water permeable hole 22 is not limited to such a long hole shape. In the present embodiment, the opening ratio of the water permeable holes 22 to the area of the peripheral surface of the pipe 21 is 5%. The opening ratio can be appropriately selected according to the conditions of the remaining soil 1 and the soil 2.

  The size of the pipe 21 is 40 to 90 mm in diameter and 2000 to 3000 mm in length. Of course, the size is not limited, and can be appropriately selected depending on conditions and the like.

  On the inner periphery near the rear end 23 of the pipe 21, there is provided a locking projection 24 protruding toward the center. The convex portion 24 is for obtaining a rotational force by engaging with a driving portion of a rotary driving device 31 such as a motor described later.

  Then, the pile 12 and the pipe 21 are driven into the guest soil 2 and the residual soil 1 from the slope 2a of the guest soil 2 to enter. First, as shown in FIG. 5, the pile 12 is driven first. To enter. When driving in and entering, first, the rear end portion 13 of the pile 12 is set in a rotary drive device 31 such as a motor. For example, a gantry having rails or the like is installed outside the slope, and the rotation drive device 31 is set on the gantry. Press it in. Thereby, the pile 12 is rotationally pressed into the soil 2 from the slope 2a and into the remaining soil 1 from the slope 1a. Such a casting method is merely an example, and various other known methods can be employed.

  At this time, the driving of the pile 12 is driven in the elevation direction, that is, obliquely upward. The driving angle in the depression direction is, as shown in FIG. 5, the driving angle θ is 0 <θ ≦ 10 degrees is preferred.

  In this manner, the pile 12 is driven from the slope 2a, and when the pile 12 is driven to a considerable extent, the drive unit of the rotary drive device 31 is temporarily driven while the rear end portion 13 of the pile 12 has not yet entered the ground. The fixing to the rear end 13 of the pile 12 is released, and the leading end of the pipe 21 is connected and fixed to the rear end 13 of the pile 12. The connection and fixing can be appropriately selected such as welding and fixing by a fixing member.

  When the connection between the pile 12 and the pipe 21 is fixed, the rear end 23 of the pipe 21 and the drive unit of the rotary drive device 31 are fixed, and then the pipe 21 is rotationally press-fitted and penetrates into the ground.

  In this way, the pipes 21 are successively added to enter the ground, and when the total length of the piles 12 and the pipes 21 that have entered the ground reaches a predetermined length, these driving operations are completed.

  In this case, at least the pile 12 reaches the remaining soil 1, and the rear end 23 of the pipe 21 slightly protrudes from the slope 2a as shown in FIG. As shown in FIG. 7, for example, when the pile 12 is a pile in which blades are spirally provided on the outer periphery, all the outer blades enter the embankment and secure pull-out resistance in the embankment. The state that can be done is good. Such a length is determined in consideration of the strength of the remaining soil 1.

  Then, the pile 12 and the pipe 21 are driven into a plurality of places with respect to the slope, that is, as shown in FIG. At this time, as shown in FIG. 6, the pitch m in the horizontal direction of each pile 12, the entry of the pipe 21, and the driving portion P is set to 2 to 3 m. In addition, the interval n between the upper and lower rows when driving in a staggered arrangement is set to 2 to 3 m.

  When the pile 12 and the pipe 21 are made to enter the predetermined length and left in the remaining soil 1 and the soil 2, as shown in FIG. 9, plants and seedlings such as desired trees 51 are planted in the soil 2. Good.

  As described above, according to the present embodiment, first, from the viewpoint of the entire construction, the soil 2 is stacked on the remaining soil 1, and then the pile 12 and the pipe 21 are driven into the pile. Since the pipes 21 may be left in the remaining soil 1 and the guest soil 2 and the desired trees 51 and the like may be planted in the guest soil 2 thereafter, the construction as a whole is extremely simple.

  Also, since the pile 12 and the pipe 21 have a relatively small diameter (90 mm or less in diameter), a simple and small rotary drive device 31 is sufficient for driving the pile 12 and the pipe 21 into the ground. Compared with the construction method, labor and labor are much reduced.

  Incidentally, the residual soil 1 and the soil 2 have significantly different cone indices, and it is conceivable that the soil 2 may slide down and collapse due to permeation of rainwater or the like. The pile 12 left after being driven in is provided with a helical blade 11 on the outer periphery thereof, and these have an anchor function. A pipe 21 is fixedly connected to the pile 12 and is driven into the ground a plurality of times substantially longer than the thickness of the soil 2, and furthermore, a large number of water-permeable holes 22 are formed in the pipe 21. Since it was driven at an elevation angle, it is left underground in the direction of descending to the slopes 1a and 2a. Therefore, the rainwater that has permeated into the soil 2 is quickly discharged to the outside of the slope 2 a from the water-permeable hole 22 of the pipe 21. From these facts, even if rainwater permeates the soil 2, the soil 2 is prevented from sliding down from the remaining soil 1 and collapsing on the slope.

  In the above-described embodiment, the pile 12 having an anchor function used as a reinforcing material has an auger screw shape in which the blades 11 are provided in a spiral shape on the outer periphery of the main body 10, but is not limited thereto. The reinforcing material having an anchoring function used in the present invention can be easily propelled into the ground and, when left behind in the ground, may have an anchoring function such as by locking to the ground. .

  Further, in the above-described embodiment, the construction was performed for the embankment of the remaining soil 1. However, the present invention is not limited to such a remaining soil, but is applicable to, for example, embankment of general earth and sand.

  INDUSTRIAL APPLICATION This invention is useful at the time of greening the slope of the surplus soil in the state of the embankment.

DESCRIPTION OF SYMBOLS 1 Remaining soil 1a Slope 2 Slope 2a Slope 10 Main body 11 Blade 12 Pile 13 Rear end 21 Pipe 22 Water permeable hole 23 Rear end 24 Convex part 31 Rotary drive device d Thickness m Pitch n Vertical interval P Driving part

Claims (5)

Greening the embankment slope,
Laying the soil on at least the slope surface of the embankment,
After that, the reinforcing material having the anchor function is entered while being rotated by the rotary drive device from the slope side of the soil at an elevation angle of greater than 0 degree and 10 degrees or less,
Continue to the reinforcement, it is connected with the reinforcing material, and are water permeable holes on the circumferential surface is formed, near the rear end portion of the projecting portion for obtaining a further drive unit and the engaging locks the rotation force of the rotation driving device Entering while rotating the pipe having the inner periphery by the rotation drive device , perform the entry work of the pipe at least until the reinforcing material reaches the embankment,
A greening method for an embankment slope, comprising performing at least one of tree planting and seedling planting on the soil after performing the approaching operation at a plurality of locations on the slope of the soil. The method of claim 1, wherein a slope of the mound of the slope of the embankment and the slope of the guest soil is 0.6 to 2.0. The method for greening an embankment slope according to claim 1, wherein a length of the pipe is longer than a thickness of the soil. The method for greening an embankment slope according to any one of claims 1 to 3, wherein a thickness of stacking the guest soil on the embankment is 0.2 to 1.4 m. The length of the embankment slope according to any one of claims 1 to 4, wherein the length of the reinforcement entering the embankment is a length capable of sufficiently exerting an anchor function required for reinforcement. Greening method.

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